Define one newton force?​

the time rate of change of an object is directly proportional to the force acting on it unless an external force act on it to change it states of motion and takes the direction of the force

Explanation:

One Newton is the amount of force required to give a 1 kg mass an acceleration of 1 m/s/s. One Newton is equal to 1 kilograms meter per second squared.

increase masses, decrease separation

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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